Driving Method of Backlight Unit and Display Device

Abstract

The present application provides a driving method for a backlight unit and a display device. The controller receives the abnormal information of the target backlight driver in the same column sent by the first-level backlight driver of each column through the feedback line. When the target backlight driver monitors that there is an abnormality in the target backlight driver, it sequentially forwards the abnormal information through the feedback line until it is transmitted to the first-level backlight driver. Then, the controller can generate a control instruction according to the abnormal information of the target backlight driver, and send the control instruction to the first-level backlight driver through the data line. The first-level backlight driver sequentially forwards the control instruction backward through the data line until it is transmitted to the target backlight driver, so as to process the target backlight driver through the control instruction. In the solution of the present application, only the abnormal information of the target backlight driver with an abnormality needs to be fed back to the controller, and it is not necessary to feed back the working information of all backlight drivers to the controller, thereby reducing the amount of data processing.

Description

Technical Field

[0001] The present application relates to the field of displays, and in particular, to a driving method for a backlight unit and a display device. Background Art

[0002] Currently, backlight driving mainly uses single-line transmission or double-line transmission, and multi-line transmission can also be used. Whether it is single-line transmission, double-line transmission or multi-line transmission, it is necessary to continuously feedback the working states of all backlight driving chips, and it is necessary to continuously feedback monitoring signals every frame.

[0003] In this way, the data processing volume is very large, and since all backlight driver chips are continuously read every frame, it takes a lot of time and affects the transmission speed of the data transmitted to the backlight driver. Summary of the Invention

[0004] The present application provides a driving method for a backlight unit and a display device, which reduces the data processing volume and improves the data transmission speed.

[0005] In a first aspect, the present application provides a driving method for a backlight unit. The backlight unit includes multiple columns of backlight drivers, and each column of backlight drivers is cascade-connected through a data line and a feedback line; the first-stage backlight driver of each column is connected to a controller through the data line and the feedback line. The method is applicable to the controller, and the method includes:

[0006] Receiving, through the feedback line, the abnormal information of a target backlight driver in the same column sent by the first-stage backlight driver; when the target backlight driver monitors that there is an abnormality in the target backlight driver, the abnormal information of the target backlight driver is sequentially transmitted forward through the feedback line until it is transmitted to the first-stage backlight driver;

[0007] Generating a control instruction according to the abnormal information of the target backlight driver, and sending the control instruction to the first-stage backlight driver through the data line. The first-stage backlight driver sequentially transmits the control instruction backward through the data line until it is transmitted to the target backlight driver, so as to process the target backlight driver through the control instruction.

[0008] Optionally, the generating a control instruction according to the abnormal information of the target backlight driver specifically includes:

[0009] Generating a first control instruction according to the abnormal information of the target backlight driver, where the first control instruction is used to control the controller to stop working so that the target backlight driver stops working;

[0010] Alternatively, generate a second control instruction according to the abnormal information of the target backlight driver, where the second control instruction is used to control the target backlight driver to stop working or turn off the channels of the target backlight driver.

[0011] Optionally, generating a control instruction according to the abnormal information of the target backlight driver specifically includes:

[0012] Send the abnormal information of the target backlight driver to a remote monitoring server;

[0013] Receive the abnormal handling method sent by the remote monitoring server, and generate a control instruction according to the abnormal handling method.

[0014] Optionally, when the number of the target backlight drivers is multiple;

[0015] Generating a control instruction according to the abnormal information of the target backlight driver, and sending the control instruction to the first-stage backlight driver through the data line specifically includes:

[0016] Generate corresponding control instructions according to the abnormal information of each target backlight driver, and sequentially send the corresponding control instructions to each target backlight driver according to the abnormal priority of each target backlight driver.

[0017] In a second aspect, the present application provides a display device, including: a backlight unit and a controller, where the backlight unit includes multiple columns of backlight drivers, and each column of backlight drivers is cascaded through a data line and a feedback line; the first-stage backlight driver of each column is connected to the controller through the data line and the feedback line;

[0018] When the target backlight driver detects an abnormality in the target backlight driver, forward the abnormal information of the target backlight driver sequentially through the feedback line until it is transmitted to the first-stage backlight driver; the first-stage backlight driver sends the abnormal information of the target backlight driver to the controller through the feedback line;

[0019] The controller generates a control instruction according to the abnormal information of the target backlight driver, and sends the control instruction to the first-stage backlight driver through the data line;

[0020] The first-stage backlight driver sequentially forwards the control instruction backward through the data line until it is transmitted to the target backlight driver to process the target backlight driver through the control instruction.

[0021] Optionally, the controller includes a system-on-chip, and the system-on-chip is connected to the first-stage backlight driver of each column;

[0022] The system-on-chip determines a corresponding exception handling method according to the exception information of the target backlight driver, and generates a control instruction according to the exception handling method.

[0023] Optionally, the controller includes a system-on-chip and a backlight controller. The system-on-chip is connected to the backlight controller, and the backlight controller is connected to the first-stage backlight driver of each column;

[0024] The first-stage backlight driver sends the exception information of the target backlight driver to the backlight controller;

[0025] The backlight controller determines a corresponding exception handling method according to the exception information of the target backlight driver, and generates a control instruction according to the exception handling method;

[0026] Or, the backlight controller sends the exception information of the target backlight driver to the system-on-chip; the system-on-chip determines a corresponding exception handling method according to the exception information of the target backlight driver, and sends the exception handling method to the backlight controller; the backlight controller generates a control instruction according to the exception handling method.

[0027] Optionally, the controller includes a system-on-chip, a timing controller, and a backlight controller. The system-on-chip is connected to the timing controller, the timing controller is connected to the backlight controller, and the backlight controller is connected to the first-stage backlight driver of each column;

[0028] The first-stage backlight driver sends the exception information of the target backlight driver to the backlight controller;

[0029] The backlight controller determines a corresponding exception handling method according to the exception information of the target backlight driver, and generates a control instruction according to the exception handling method;

[0030] Or, the backlight controller sends the exception information of the target backlight driver to the timing controller; the timing controller determines a corresponding exception handling method according to the exception information of the target backlight driver, and sends the exception handling method to the backlight controller; the backlight controller generates a control instruction according to the exception handling method;

[0031] Or, the backlight controller sends the exception information of the target backlight driver to the timing controller, and the timing controller sends the exception information of the target backlight driver to the system-on-chip; the system-on-chip determines a corresponding exception handling method according to the exception information of the target backlight driver, and sends the exception handling method to the backlight controller; the backlight controller generates a control instruction according to the exception handling method.

[0032] Optionally, the system-on-chip is further configured to upload the exception information of the target backlight driver to a remote monitoring server, and generate a control instruction after receiving the exception handling method sent by the remote monitoring server.

[0033] Optionally, each backlight driver includes a feedback function module, and the feedback function module includes at least one of the following check modules:

[0034] Input / output open circuit check module, fault check module, overheat check module, light-emitting unit open circuit check module, light-emitting unit short circuit check module, and drive channel voltage check module;

[0035] The input / output open circuit check module checks whether there is a fault in the data line connected to the corresponding backlight driver.

[0036] The fault check module checks whether there is a fault in the corresponding backlight driver itself.

[0037] The overheat check module checks whether the temperature of the corresponding backlight driver is abnormal.

[0038] The light-emitting unit open circuit check module checks whether there is an open circuit fault in the corresponding light-emitting unit.

[0039] The light-emitting unit short circuit check module checks whether there is a short circuit fault in the corresponding light-emitting unit.

[0040] The drive channel voltage check module checks the voltage of each channel of the corresponding backlight driver.

[0041] The driving method of the backlight unit and the display device provided by this application, the backlight unit includes multiple columns of backlight drivers, each column of backlight drivers is cascaded through a data line and a feedback line, the first-stage backlight driver of each column is connected to the controller through a data line and a feedback line, the controller receives the exception information of the target backlight driver in the same column sent by the first-stage backlight driver through the feedback line, when the target backlight driver monitors that there is an exception in the target backlight driver, the exception information of the target backlight driver is sequentially transmitted forward through the feedback line until it is transmitted to the first-stage backlight driver. Then, the controller can generate a control instruction according to the exception information of the target backlight driver, and send the control instruction to the first-stage backlight driver through the data line, and the first-stage backlight driver sequentially transmits the control instruction backward through the data line until it is transmitted to the target backlight driver, so as to process the target backlight driver through the control instruction. Therefore, the solution of this application only needs to return the exception information of the target backlight driver with an exception to the controller, without returning the working information of all backlight drivers to the controller, thereby reducing the amount of data processing and improving the transmission speed of the data transmitted to the backlight driver. Description of the Drawings

[0042] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0043] Figure 1 Schematic diagram of a backlight unit provided by an embodiment of the present application;

[0044] Figure 2 Schematic flowchart of a driving method for a backlight unit provided by an embodiment of the present application;

[0045] Figure 3 Schematic diagram of a display device provided by an embodiment of the present application;

[0046] Figure 4 Schematic diagram of a display device provided by another embodiment of the present application;

[0047] Figure 5 Schematic diagram of a display device provided by yet another embodiment of the present application;

[0048] Figure 6 Schematic diagram of a display device provided by still another embodiment of the present application;

[0049] Figure 7 Schematic diagram of another display device provided by an embodiment of the present application;

[0050] Figure 8 Schematic diagram of another display device provided by another embodiment of the present application;

[0051] Figure 9 Schematic diagram of a backlight driver provided by an embodiment of the present application;

[0052] Figure 10 Schematic diagram of the pins of a backlight driver provided by an embodiment of the present application;

[0053] Figure 11 Schematic diagram of a backlight unit provided by another embodiment of the present application. Detailed implementation manners

[0054] To make the objectives, technical solutions, and advantages of this application more clear, the following will, in conjunction with the accompanying drawings in this application, clearly and completely describe the technical solutions in this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of this application.

[0055] In the display field, LED (light-emitting diode) backlight drive circuits play an important role. With the rapid development of high-definition and large-screen display technologies, higher requirements are imposed on the performance and accuracy of LED backlight drive circuits.

[0056] An LED backlight drive circuit includes a backlight drive chip (which can also be referred to as a backlight driver). The backlight drive chip can provide feedback and intelligent monitoring. The feedback and intelligent monitoring of the backlight drive chip can affect the display effect of the device, and can also impact the performance and stability of the device.

[0057] The following analyzes the importance of the feedback and intelligent monitoring of the backlight drive chip:

[0058] Optimizing the display effect: The feedback mechanism of the backlight drive chip can adjust the brightness and color of the backlight in real time, ensuring that the display screen can present the best visual effect under various ambient light conditions. Intelligent monitoring can detect the working state of the backlight drive chip in real time, ensuring the stability and consistency of the display effect.

[0059] Improving energy efficiency: Through intelligent monitoring, the working state of the backlight drive chip can be adjusted according to actual needs, avoiding unnecessary waste. And this dynamic energy management helps to extend the battery life of the device and improve energy efficiency. For example, in a situation where the ambient light is relatively dim, the display system can reduce the brightness of the backlight unit to save electrical energy.

[0060] Enhancing device stability: The feedback and intelligent monitoring of the backlight drive chip help to detect and handle potential problems in a timely manner, contributing to reducing the failure rate of the device and improving the reliability and stability of the device. For example, when the backlight drive chip fails or its performance deteriorates, the intelligent monitoring system can issue an alarm to remind the user or maintenance personnel to take timely measures for repair or replacement.

[0061] Enhancing the user experience: Through optimizing the display effect and improving energy efficiency, the feedback and intelligent monitoring of the backlight drive chip help to enhance the overall user experience. Users can obtain a clearer and more vivid display effect, and at the same time do not have to worry about problems such as performance degradation or failure during the use of the device.

[0062] In summary, the feedback and intelligent monitoring of the backlight driving chip are of great significance in electronic devices. It can not only improve the display effect and energy efficiency of the device, but also enhance the stability and user experience of the device.

[0063] Currently, backlight driving mainly adopts single-line transmission or double-line transmission, and multi-line transmission can also be used.

[0064] Single-line transmission adopts the method of time-division multiplexing of the data line. Specifically, within one frame, the controller transmits the control signal and the brightness signal to the backlight driving chip. The backlight driving chip controls the LED for brightness display, and then the backlight driving chip transmits part or all of the monitoring signals back to the controller. The control signal is used to control the backlight driving chip to enable the target function, and the target function can include, for example, a delay function, an open-circuit function, a short-circuit function, etc.

[0065] Double-line or multi-line transmission uses a separate feedback line for transmission. Generally, within one frame, the controller transmits the control signal and the brightness signal to the backlight driving chip, so that the backlight driving chip can control the LED for brightness display. Then, the backlight driving chip transmits part or all of the monitoring signals of each frame back to the controller through the dedicated feedback line, or the backlight driving chip can also transmit the monitoring signals of the previous frame back to the controller at the beginning of each frame.

[0066] Therefore, in the above solutions, it is necessary to continuously transmit the working states of all backlight driving chips, and it is necessary to continuously transmit the monitoring signals in each frame. The data processing volume is very large, and since all backlight driver chips are continuously read in each frame, it takes a lot of time and affects the transmission speed of the data transmitted to the backlight driver.

[0067] For this reason, the present application provides a driving method for a backlight unit. The controller receives the abnormal information of the target backlight driver in the same column sent by the first-level backlight driver of each column. When the target backlight driver monitors that there is an abnormality in the target backlight driver, it transmits the abnormal information of the target backlight driver to the previous-level backlight driver of the target backlight driver until the abnormal information of the target backlight driver is transmitted to the first-level backlight driver, and then the first-level backlight driver transmits the abnormal information of the target backlight driver back to the controller. Thus, only the abnormal information of the target backlight driver with an abnormality needs to be transmitted back to the controller, and there is no need to transmit the working information of all backlight drivers back to the controller, reducing the data processing volume and improving the transmission speed of the data transmitted to the backlight driver.

[0068] The technical solution of the present application will be described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0069] To facilitate the understanding of the solution of the present application, the backlight unit provided in the embodiments of the present application will be described first. As Figure 1 shown, the backlight unit provided in this embodiment includes:

[0070] Multiple columns of backlight drivers 10, and each column of backlight drivers is cascaded through data lines 201 and feedback lines 202; the first-stage backlight driver of each column is connected to the controller 30 through the data line 201 and the feedback line 202. Among them, the first-stage backlight driver is the backlight driver closest to the controller 30 in a column of backlight drivers.

[0071] Each backlight driver 10 can be connected to multiple light-emitting units 20 of the light-emitting unit. The light-emitting unit 20 can include, for example, one or more LEDs.

[0072] For example, the first-row backlight driver is used as the first-stage backlight driver, the second-row backlight driver is used as the second-stage backlight driver, and so on. The (M-1)-th row backlight driver is used as the (M-1)-th stage backlight driver, and the M-th row backlight driver is used as the M-th stage backlight driver.

[0073] Taking the first-column backlight driver as an example, the first-stage backlight driver is connected to the second-stage backlight driver through a data line, the second-stage backlight driver is connected to the third-stage backlight driver through a data line, and so on. The (M-1)-th stage backlight driver is connected to the M-th stage backlight driver through a data line.

[0074] Next, the driving method of the backlight unit provided in the embodiments of the present application will be described. The driving method of this backlight unit is applied to the controller, and the controller can be Figures 3 - 6 any controller, which is not limited here. Among them, Figures 3 - 6 is a schematic structural diagram of a display device provided in some embodiments of the present application.

[0075] Figure 2 shows a schematic flow chart of the driving method of the backlight unit provided in the embodiments of the present application. As Figure 2 shown, the driving method of the backlight unit provided in the embodiments of the present application includes:

[0076] S101. The controller receives the abnormal information of the target backlight driver in the same column sent by the first-stage backlight driver through the feedback line.

[0077] Among them, the target backlight driver is any backlight driver among multiple backlight drivers. The target backlight driver can be one backlight driver or multiple backlight drivers.

[0078] When the target backlight driver detects an abnormality, it can sequentially transmit the abnormality information of the target backlight driver forward through the feedback line until the first-level backlight driver in the same column.

[0079] For example, in the direction away from the controller, the backlight drivers in each column are sequentially referred to as the first-level backlight driver to the Nth-level backlight driver, where N is an integer greater than 1. The target backlight driver can be the Mth-level backlight driver in any column, where M is an integer greater than 1.

[0080] When the Mth-level backlight driver detects an abnormality in itself, it transmits the abnormality information of the Mth-level backlight driver to the (M - 1)th-level backlight driver in the same column through the feedback line. The (M - 1)th-level backlight driver then transmits the abnormality information of the Mth-level backlight driver to the (M - 2)th-level backlight driver in the same column through the feedback line, and so on, until the abnormality information of the Mth-level backlight driver is transmitted to the first-level backlight driver in the same column. The first-level backlight driver can then send the abnormality information of the Mth-level backlight driver to the controller through the feedback line.

[0081] Exemplarily, the abnormality of the target backlight driver can include the abnormality of the target backlight driver itself, the abnormality of the data line connected to the target backlight driver, the abnormality of the light-emitting unit connected to the target backlight driver, etc. The abnormality of the target backlight driver itself can include the failure of the target backlight driver itself, the temperature abnormality of the target backlight driver, etc. The abnormality of the data line connected to the target backlight driver can include the open circuit or short circuit of the data line connected to the target backlight driver. The abnormality of the light-emitting unit connected to the target backlight driver can include the open circuit or short circuit of the light-emitting unit connected to the target backlight driver.

[0082] Correspondingly, the abnormality information of the target backlight driver can include the specific failure of the target backlight driver. The abnormality information of the target backlight driver can also include the address of the target backlight driver for subsequent sending of control instructions to the target backlight driver.

[0083] In this embodiment, within any frame period, each backlight driver can detect whether there is an abnormality in itself, whether there is an abnormality in the data line connected to the backlight driver, whether there is an abnormality in the light-emitting unit connected to the target backlight driver, etc.

[0084] Exemplarily, the number of target backlight drivers is multiple. Each target backlight driver can sequentially transmit the abnormality information forward through the data line when it detects an abnormality in itself until the first-level backlight driver.

[0085] For example, the target backlight drivers include the Mth-level backlight driver and the mth-level backlight driver in the same column, where m is an integer greater than 0 and less than M. The Mth-level backlight driver

[0086] Since the M - th level backlight driver needs to forward the abnormal information of the M - th level backlight driver, when the abnormal information is passed to the m - th level backlight driver, the m - th level backlight driver may have already forwarded the abnormal information of the m - th level backlight driver, so they will not affect each other. And after the m - th level backlight driver receives the abnormal information of the M - th level backlight driver, the m - th level backlight driver will forward the abnormal information of the M - th level backlight driver.

[0087] In other embodiments, the controller can also receive the abnormal information of the target backlight driver in the same column sent by the first - level backlight driver of each column through the data line, reducing the wiring and the complexity of the processing technology.

[0088] S102. The controller generates a control instruction according to the abnormal information of the target backlight driver, and sends the control instruction to the first - level backlight driver through the data line. The first - level backlight driver sequentially forwards the control instruction backward through the data line until it is passed to the target backlight driver to process the target backlight driver through the control instruction. Exemplarily, the control instruction includes an abnormal handling method.

[0089] In some embodiments, the controller generates a first control instruction according to the abnormal information of the target backlight driver, and the first control instruction is used to control the controller to stop working so that the target backlight driver stops working.

[0090] In some embodiments, the controller generates a second control instruction according to the abnormal information of the target backlight driver, and the second control instruction is used to control the target backlight driver to stop working or close the channel between the target backlight driver and the light - emitting unit. Here, the channel refers to the channel between the target backlight driver and the light - emitting unit.

[0091] In some embodiments, the controller generates a third control instruction according to the abnormal information of the target backlight driver, and the third control instruction is used to send a stop instruction to the power supply system corresponding to the backlight unit. The stop instruction is used to control the power supply system to stop power supply so that the target backlight driver stops working. It should be noted that when the power supply system corresponding to the backlight unit stops power supply, each backlight driver stops working. Correspondingly, the target backlight driver stops working.

[0092] Exemplarily, when the number of target backlight drivers is multiple, the control instruction may include the address and handling method of each target backlight driver. After each level of backlight driver receives the control instruction, it can determine whether the address of the target backlight driver carried in the control instruction is the same as its own address. If they are the same, it can obtain the corresponding handling method.

[0093] For example, if the abnormal information of the target backlight driver indicates that a data line connected to the target backlight driver has failed, the controller can be controlled to stop working to control the target backlight driver to stop working, or a stop instruction can be sent to the power supply system corresponding to the backlight unit to cause the power supply system corresponding to the backlight unit to stop working, thereby causing the target backlight driver to stop working.

[0094] If the abnormal information of the target backlight driver indicates that a light-emitting unit connected to the target backlight driver has failed, a control instruction can be generated and sent to the target backlight driver to control the target backlight driver to stop working or to control the target backlight driver to close the channel.

[0095] In some embodiments, after receiving the abnormal information of the target backlight driver, the controller can send the abnormal information of the target backlight driver to the remote monitoring server. The remote monitoring server can determine the abnormal handling method according to the abnormal information of the target backlight driver, and generate a control instruction according to the abnormal handling method and send it to the controller. After receiving the control instruction sent by the remote monitoring server, the controller processes the display device corresponding to the backlight unit according to the abnormal handling method in the control instruction. For example, controlling the display device to shut down, controlling the display device to turn off a certain function, controlling the display device to turn on certain functions, etc.

[0096] In some embodiments, when the number of target backlight drivers is multiple, control instructions can be generated according to the abnormal information of each target backlight driver, and the corresponding control instructions can be sent to each target backlight driver sequentially and separately according to the abnormal priority of each target backlight driver. It can be understood that the higher the priority of the abnormal information, the more urgently it needs to be processed, so that the abnormality can be processed in time. Among them, the control instruction can include the address of the target backlight driver and the abnormal handling method.

[0097] In other embodiments, when the number of target backlight drivers is multiple, control instructions can be generated according to the abnormal information of each target backlight driver, and the control instructions of the multiple target backlight drivers can be sent to the first-level backlight driver together. The first-level backlight driver forwards the control instructions of the multiple target backlight drivers backward. After each backlight driver receives the control instructions of the multiple target backlight drivers, it can identify the addresses in each control instruction. If it identifies an address that is the same as its own address, it can obtain the corresponding abnormal handling method from the control instruction corresponding to that address.

[0098] The driving method of the backlight unit provided by this application is such that the controller receives the abnormal information of the target backlight driver in the same column sent by the first-stage backlight driver through the feedback line, and processes it according to the abnormal information of the target backlight driver, so that it is not necessary to transmit the working information of all backlight drivers to the controller, reducing the amount of data processing and improving the transmission speed of the data transmitted to the backlight unit.

[0099] Figure 3 It is a schematic structural diagram of a display device provided by an embodiment of this application. Combining Figure 1 and Figure 3 as shown, the display device provided by this embodiment includes:

[0100] A backlight unit 50 and a controller 30. The backlight unit 50 includes multiple columns of backlight drivers 20, and each column of backlight drivers is cascaded through a data line 201 and a feedback line 202; the first-stage backlight driver of each column is connected to the controller 30 through the data line 201 and the feedback line 202;

[0101] When the target backlight driver monitors that there is an abnormality in the target backlight driver, it sequentially forwards the abnormal information of the target backlight driver through the feedback line until it is transmitted to the first-stage backlight driver;

[0102] The first-stage backlight driver sends the abnormal information of the target backlight driver to the controller 30 through the feedback line 202;

[0103] The controller 30 generates a control instruction according to the abnormal information of the target backlight driver, and sends the control instruction to the first-stage backlight driver through the data line 201;

[0104] The first-stage backlight driver sequentially forwards the control instruction backward through the data line 201 until it is transmitted to the target backlight driver to process the target backlight driver through the control instruction.

[0105] It should be noted that forwarding sequentially means forwarding sequentially in the direction close to the controller, and backward sequential transmission means forwarding sequentially in the direction away from the controller.

[0106] It can be understood that if the target backlight driver is the first-stage backlight driver, the abnormal information of the target backlight driver can be directly sent to the controller.

[0107] Exemplarily, the abnormal information may include the address of the target backlight driver and the specific fault of the target backlight driver.

[0108] In some embodiments, such as Figure 4As shown, the controller 30 includes a System On Chip (SOC) 301. The system-on-chip 301 integrates multiple functions such as a central processing unit (CPU), a graphics processing unit (GPU), an audio processor, a video decoding processor, and a network interface. The system-on-chip 301 can be responsible for controlling and processing various types of data such as signals, images, and sounds, ensuring the stability and reliability of the device.

[0109] In practical applications, the system-on-chip 301 is a core component of a Mini LED TV. The system-on-chip 301 can not only process video signals but also support various advanced functions through its powerful computing capabilities, such as intelligent image processing and audio optimization.

[0110] Since the system-on-chip 301 can be responsible for the overall control and data processing of the device, the system-on-chip 301 can directly control the backlight driver. In this embodiment, the system-on-chip 301 is connected to the first-stage backlight driver of each column. The system-on-chip 301 can determine the corresponding exception handling method based on the exception information of the target backlight driver and generate a control instruction according to the exception handling method.

[0111] Exemplarily, the system-on-chip presets exception handling methods for various faults. After receiving the exception information of the target backlight driver sent by the first-stage backlight driver, it can determine the exception handling method corresponding to the target backlight driver according to the preset exception handling methods for various faults, and then generate a control instruction according to the exception handling method corresponding to the target backlight driver.

[0112] For example, the system-on-chip can generate a control instruction according to the exception information of the target backlight driver, send the control instruction to the first-stage backlight driver through a data line, and the first-stage backlight driver sends the control instruction to the second-stage backlight driver through the data line until the control instruction is sent to the target backlight driver. The control instruction can instruct the target backlight driver to stop working or close the channel of the target backlight driver. Among them, the exception information of the target backlight driver received by the system-on-chip can include the address of the target backlight driver. When generating the control instruction, the system-on-chip can carry the address of the target backlight driver in the control instruction so as to send the control instruction to the target backlight driver.

[0113] For another example, the system-on-chip can send a stop instruction to the power supply system corresponding to the backlight unit according to the exception information of the target backlight driver to control the power supply system to stop power supply, so that the target backlight driver stops working.

[0114] In some other embodiments, such as Figure 5As shown in the figure, the controller 30 includes a system-on-chip 301 and a backlight controller 302. The system-on-chip 301 is connected to the backlight controller (Dimming controller) 302. The backlight controller 302 is responsible for the timing and brightness of the backlight unit, ensuring that the brightness is synchronously scanned with the image, thereby achieving a better picture quality effect. The backlight controller 302 is connected to the first-stage backlight driver of each column. At this time, the first-stage backlight driver can send the abnormal information of the target backlight driver to the backlight controller 302.

[0115] As an implementation method, various fault exception handling methods can be preset in the backlight controller. Therefore, after the backlight driver receives the abnormal information of the target backlight driver, it can determine the exception handling method corresponding to the target backlight driver according to the abnormal information of the target backlight driver, and generate a control instruction according to the exception handling method corresponding to the target backlight driver.

[0116] For example, the backlight controller can generate a control instruction according to the abnormal information of the target backlight driver, send the control instruction to the first-stage backlight driver through the data line, and the first-stage backlight driver sends the control instruction to the second-stage backlight driver through the data line until the control instruction is sent to the target backlight driver, so that the target backlight driver stops working or closes the channel of the target backlight driver.

[0117] For another example, the backlight controller can control itself to stop working according to the abnormal information of the target backlight driver, so that the target backlight driver stops working.

[0118] For yet another example, the backlight controller can send a stop instruction to the power supply system corresponding to the backlight unit according to the abnormal information of the target backlight driver. The stop instruction is used to control the power supply system to stop power supply, so that the target backlight driver stops working.

[0119] As another implementation method, various fault exception handling methods can be preset in the system-on-chip. Therefore, after the backlight driver receives the abnormal information of the target backlight driver, it can send the abnormal information of the target backlight driver to the system-on-chip; the system-on-chip can determine the exception handling method corresponding to the target backlight driver according to the abnormal information of the target backlight driver, and send the exception handling method corresponding to the target backlight driver to the backlight controller; the backlight controller generates a control instruction according to the exception handling method corresponding to the target backlight driver.

[0120] For example, the system-on-chip can send a stop instruction to the backlight controller according to the abnormal information of the target backlight driver, so that the backlight controller stops working, and further makes the target backlight driver stop working.

[0121] For another example, the system-on-chip can send a stop instruction to the power supply system corresponding to the backlight unit according to the abnormal information of the target backlight driver, so that the power supply system stops working, and further the target backlight driver stops working.

[0122] For another example, the system-on-chip can generate a control instruction according to the abnormal information of the target backlight driver, send the control instruction to the backlight controller, and the backlight controller sends the control instruction to the first-stage backlight driver through the data line until the control instruction is sent to the target backlight driver, so that the target backlight driver stops working or closes the channel of the target backlight driver.

[0123] In some other embodiments, as Figure 6 shown, the controller includes a system-on-chip 301, a timing controller (TCON) 303, and a backlight controller 302. The timing controller 303 is responsible for the timing actions of the liquid crystal display screen to ensure that the image can be correctly displayed, and is also responsible for the display function and signal transmission of the backlight. The timing controller 303 converts the video signal output by the system-on-chip 301 into a data signal that the liquid crystal display screen can directly use and a control signal for the backlight driver. The timing controller 303 can accurately control the brightness and timing of each light-emitting unit to achieve a higher contrast ratio. The system-on-chip 301, the timing controller 303, and the backlight controller 302 work together. The system-on-chip 301, as the core component, is responsible for the overall control and data processing of the device; the timing controller 303 converts the video signal into a format that the liquid crystal display screen can use to ensure that the image is correctly displayed; while the backlight controller 302 focuses on backlight control to improve the picture quality effect. The three together constitute the display system of the display device, providing a good visual experience for users.

[0124] As an implementation method, various abnormal handling methods for faults can be preset in the backlight controller. Therefore, after the backlight controller receives the abnormal information of the target backlight driver, it can determine the abnormal handling method corresponding to the target backlight driver according to the abnormal information of the target backlight driver, and generate a control instruction according to the abnormal handling method corresponding to the target backlight driver.

[0125] For example, the backlight controller can generate a control instruction according to the abnormal information of the target backlight driver, send the control instruction to the first-stage backlight driver through the data line, and the first-stage backlight driver sends the control instruction to the second-stage backlight driver through the data line until the control instruction is sent to the target backlight driver, so that the target backlight driver stops working or closes the channel of the target backlight driver.

[0126] For another example, the backlight controller can control the backlight controller to stop working according to the abnormal information of the target backlight driver, so that the target backlight driver stops working.

[0127] For another example, the backlight controller may send a stop instruction to the power supply system corresponding to the backlight unit according to the exception information of the target backlight driver. The stop instruction is used to control the power supply system to stop power supply, so that the target backlight driver stops working.

[0128] As another implementation manner, multiple exception handling methods for various faults may be preset in the timing controller. Therefore, after the backlight driver receives the exception information of the target backlight driver, it may send the exception information of the target backlight driver to the timing controller; the timing controller may determine the corresponding exception handling method according to the exception information of the target backlight driver, and send the exception handling method to the backlight controller; the backlight controller generates a control instruction according to the exception handling method.

[0129] For example, the timing controller may send a stop instruction to the backlight controller according to the exception information of the target backlight driver, so that the backlight controller stops working, and further causes the target backlight driver to stop working.

[0130] For another example, the timing controller may send a stop instruction to the power supply system corresponding to the backlight unit according to the exception information of the target backlight driver, so that the power supply system stops working, and further causes the target backlight driver to stop working.

[0131] For another example, the timing controller may generate a control instruction according to the exception information of the target backlight driver, send the control instruction to the backlight controller, and the backlight controller sends the control instruction to the first-stage backlight driver through the data line until the control instruction is sent to the target backlight driver, so that the target backlight driver stops working or closes the channel of the target backlight driver.

[0132] As yet another implementation manner, multiple exception handling methods for various faults may be preset in the system-on-chip. Therefore, after the backlight driver receives the exception information of the target backlight driver, it may send the exception information of the target backlight driver to the timing controller, and the timing controller then sends the exception information of the target backlight driver to the system-on-chip; the system-on-chip may determine the corresponding exception handling method according to the exception information of the target backlight driver, and send the exception handling method to the timing controller, and the timing controller sends the exception handling method to the backlight controller; the backlight controller generates a control instruction according to the exception handling method.

[0133] For example, the system-on-chip may send a stop instruction to the timing controller according to the exception information of the target backlight driver, and the timing controller sends the stop instruction to the backlight controller, so that the backlight controller stops working, and further causes the target backlight driver to stop working.

[0134] For another example, the system-on-chip can send a stop instruction to the power supply system corresponding to the backlight unit according to the abnormal information of the target backlight driver, so that the power supply system stops working, and then the target backlight driver stops working.

[0135] For another example, the system-on-chip can generate a control instruction according to the abnormal information of the target backlight driver, send the control instruction to the timing controller, the timing controller sends the control instruction to the backlight controller, and the backlight controller sends the control instruction to the first-stage backlight driver through the data line until the control instruction is sent to the target backlight driver, so that the target backlight driver stops working or closes the channel of the target backlight driver.

[0136] In some embodiments, as Figure 7 and Figure 8 shown, the system-on-chip 301 can also upload the abnormal information of the target backlight driver to the remote monitoring server 40, and generate a control instruction after receiving the abnormal handling method sent by the remote monitoring server 40. For example, controlling the display device to shut down, controlling the display device to turn off a certain function, controlling the display device to turn on certain functions, etc. By way of example, the remote monitoring server can also perform an alarm display after receiving the abnormal information of the target backlight driver for relevant staff to handle.

[0137] In some embodiments, as Figure 9 shown, each backlight driver includes a feedback function module 204, and the feedback function module 204 includes at least one of the following inspection modules: an input / output open circuit inspection module 2041, a fault inspection module 2042, an overheat inspection module 2043, a light-emitting unit open circuit inspection module 2044, a light-emitting unit short circuit inspection module 2045, and a drive channel voltage inspection module 2046. The input / output short circuit inspection module 2041 is used to check whether there is a fault in the data line connected to the corresponding backlight driver, such as whether there is an open circuit, a short circuit, etc. The fault inspection module 2042 is used to check whether there is a fault in the corresponding backlight driver itself. The overheat inspection module 2043 is used to check whether the temperature of the corresponding backlight driver is abnormal. The light-emitting unit open circuit inspection module 2044 is used to check whether there is an open circuit fault in the light-emitting unit connected to the corresponding backlight driver. The light-emitting unit short circuit inspection module 2045 is used to check whether there is a short circuit fault in the light-emitting unit connected to the corresponding backlight driver. The drive channel voltage detection module 2046 is used to check the voltage of each channel of the corresponding backlight driver, and can feedback the voltage of each channel of the backlight driver to the controller.

[0138] In practical applications, as Figure 9As shown, each backlight driver may further include a logic processing module 205, a driving module 206, a power supply module 201, an input / output module 203, and an oscillator module 202. The power supply module 201 is connected to the logic processing module 205 and the driving module 206; the input / output module 203 is connected to the logic processing module 205 and the feedback function module 204; the oscillator module 202 is connected to the logic processing module 205; the logic processing module 205 is further connected to the feedback function module 204 and the driving module 206, and the driving module 206 is connected to the light-emitting unit.

[0139] The power supply module 201 is configured to receive an external voltage VDD and supply power to the logic processing module 205 and the driving module 206. The feedback function module 204 may transmit the working information of the current backlight driver to the logic processing module 205 and the driving module 206, and may also transmit the abnormal information of the current backlight driver to the input / output module 203.

[0140] The input / output module 203 may receive the brightness signals of at least one backlight driver and send the brightness signal of the current backlight driver to the logic processing module 205. For example, the input / output module 203 may receive the brightness signals of the current backlight driver and the remaining backlight drivers, take away the brightness signal of the current backlight driver, send the brightness signal of the current backlight driver to the logic processing module 205, and transmit the brightness signals of the remaining backlight drivers to the next-level backlight driver of the current backlight driver. The remaining backlight drivers refer to all the backlight drivers after the current backlight driver in the same column.

[0141] The input / output module 203 may also transmit the abnormal information of the current backlight driver to the previous-level backlight driver of the current backlight driver after receiving the abnormal information of the current backlight driver output by the feedback function module 204.

[0142] The oscillator module 202 is used to provide a clock signal for the logic processing module 205. The logic processing module 205 is configured to generate corresponding control signals according to the clock signal, the brightness signal, and the feedback signal, and send the control signals to the corresponding driving module 206. For example, when the feedback signal indicates that the current backlight driver is in a normal working state, corresponding control signals are generated according to the clock signal and the brightness signal.

[0143] The driving module 206 is used to control the brightness, blinking mode, etc. of the connected light-emitting unit. For example, when the feedback signal indicates that the current backlight driver is in a normal working state, the brightness of the light-emitting unit is controlled. When the feedback signal indicates that there is an abnormality in the light-emitting unit connected to the current backlight driver, the control of the light-emitting unit is stopped.

[0144] In some embodiments, each backlight driver may include multiple pins. For example, it may include a power supply pin VDD, a ground pin GND, an input pin DI, an output pin DO, a readback signal input pin SG_I, a readback signal output pin SG_O, etc., as Figure 10 shown. Combining Figure 9 and Figure 10 shown, the power supply module 201 is connected to the power supply pin VDD to receive an external voltage through the power supply pin VDD. The ground pin GND of the backlight driver is grounded to ensure the safety of the backlight driver. The input pin DI and the output pin DO are connected to the input / output module 203. The input / output module 203 receives the brightness signal of at least one backlight driver through the input pin DI, transmits the brightness signal of the remaining backlight drivers to the next-level backlight driver of the current backlight driver through the output pin DO, and transmits the abnormal information of the current backlight driver to the previous-level backlight driver of the current backlight driver through the output pin DO. The feedback function module 204 is connected to the readback signal input pin SG_I and the readback signal output pin SG_O. The feedback function module 204 receives the abnormal information of the target backlight driver sent by the next-level backlight driver of the current backlight driver through the readback signal input pin SG_I, and transmits the abnormal information of the target backlight driver to the previous-level backlight driver of the current backlight driver through the readback signal output pin SG_O.

[0145] For example, taking one column of backlight drivers as an example, the input pin DI of the first-level backlight driver 1 is connected to the controller, and the output pin DO of the first-level backlight driver 1 is connected to the input pin DI of the second-level backlight driver 2 , the output pin DO of the second-level backlight driver 2 is connected to the input pin DI of the third-level backlight driver 3 , and so on. The output pin DO of the (N - 1)-th level backlight driver N-1 is connected to the input pin DI of the N-th level backlight driver N . Then, after the input pin DI of the first-level backlight driver 1 receives the brightness signal, the brightness signal is input to the input pin DI of the second-level backlight driver through the output pin DO of the first-level backlight driver 1 , and so on, until the brightness signal is transmitted to the DI of the N-th level backlight driver through the output pin DO of the (N - 1)-th level backlight driver 2 N-1 N .

[0146] The readback signal output pin SG_O of the first-level backlight driver 1Connection controller, the readback signal input pin SG_I of the first-stage backlight driver 1 Connect to the readback signal output pin SG_O of the second-stage backlight driver 2 , the readback signal input pin SG_I of the second-stage backlight driver 2 Connect to the readback signal output pin SG_O of the third-stage backlight driver 3 , and so on, the readback signal input pin SG_I of the (N - 1)-th stage backlight driver N-1 Connect to the readback signal output pin SG_O of the N-th stage backlight driver N .

[0147] If the target backlight driver is the M-th stage backlight driver, where M is an integer greater than 1 and less than N, then the M-th stage backlight driver transmits the abnormal signal of the M-th stage backlight driver to the readback signal input pin SG_I of the (M - 1)-th stage backlight driver through the readback signal output pin SG_O of the M-th stage backlight driver M , and so on, until the readback signal input pin SG_I of the first-stage backlight driver M-1 receives the abnormal information of the M-th stage backlight driver, and then the first-stage backlight driver can transmit the abnormal signal of the M-th stage backlight driver to the controller through the readback signal output pin SG_O 1 1

[0148] In some embodiments, as Figure 11 shown, there are feedback lines connected between adjacent backlight drivers in the same column, and there is a feedback line connected between the first-stage backlight driver of each column and the controller. The feedback line is used to feedback the abnormal information of the target backlight driver to the controller. For example, there is a feedback line Single_1 connected between adjacent backlight drivers in the first column of backlight drivers, and there is a feedback line Single_n connected between adjacent backlight drivers in the n-th column of backlight drivers

[0149] Exemplarily, as Figure 11 shown, there is a data line DATA_1 connected between adjacent backlight drivers in the first column of backlight drivers, and there is a data line DATA_n connected between adjacent backlight drivers in the n-th column of backlight drivers

[0150] ​​The display device provided by the present application includes a backlight unit and a controller. When the target backlight driver in the backlight unit monitors that there is an abnormality in the target backlight driver, it forwards the abnormality information of the target backlight driver until it is transmitted to the first-level backlight driver in the same column. The first-level backlight driver sends the abnormality information of the target backlight driver to the controller, and the controller processes it according to the abnormality information of the target backlight driver. Therefore, it is not necessary to transmit the working information of all backlight drivers back to the controller, reducing the amount of data processing and improving the transmission speed of the data transmitted to the backlight.

[0151] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for driving a backlight unit, characterized in that: The backlight unit comprises a plurality of columns of backlight drivers, each column of backlight drivers being cascade-connected via a data line and a return line; The first-stage backlight driver of each column is connected to the controller via the data line and the return line. The method is applicable to the controller, and the method includes: receiving abnormal information of the target backlight driver in the same column sent by the first-level backlight driver through the return line; when the target backlight driver detects that the target backlight driver is abnormal, the target backlight driver sequentially transmits the abnormal information of the target backlight driver forward through the return line until it is transmitted to the first-level backlight driver; the abnormal information of the target backlight driver includes the specific fault of the target backlight driver; generating a control instruction according to the abnormal information of the target backlight driver, and sending the control instruction to the first-level backlight driver through the data line, and the first-level backlight driver sequentially transmits the control instruction backward through the data line until it is transmitted to the target backlight driver, so as to process the target backlight driver through the control instruction; When there are multiple target backlight drivers; generating a control instruction according to the abnormal information of the target backlight driver, and sending the control instruction to the first-level backlight driver through the data line, specifically includes: generating a corresponding control instruction according to the abnormal information of each target backlight driver, and sending the corresponding control instruction to each target backlight driver in turn according to the abnormal priority of each target backlight driver; The generating of the control instruction according to the abnormal information of the target backlight driver specifically includes: sending the abnormal information of the target backlight driver to a remote monitoring server; receiving an abnormality handling method sent by the remote monitoring server, and generating the control instruction according to the abnormality handling method.

2. The method according to claim 1, characterized in that The generating of the control instruction according to the abnormal information of the target backlight driver specifically includes: generating a first control instruction according to the abnormal information of the target backlight driver, wherein the first control instruction is used to control the controller to stop working so as to make the target backlight driver stop working; Or, a second control instruction is generated according to the abnormal information of the target backlight driver, and the second control instruction is used to control the target backlight driver to stop working or close the channel of the target backlight driver.

3. A display device, characterized in that: include: A backlight unit and a controller, wherein the backlight unit comprises a plurality of columns of backlight drivers, each column of backlight drivers being cascade-connected via a data line and a return line; The first-stage backlight driver of each column is connected to the controller via the data line and the return line; When the target backlight driver detects that the target backlight driver is abnormal, the target backlight driver sequentially transmits the abnormal information of the target backlight driver forward through the return line until it is transmitted to the first-stage backlight driver; The first-level backlight driver sends the abnormal information of the target backlight driver to the controller through the return line; the abnormal information of the target backlight driver includes the specific fault of the target backlight driver; The controller generates a control instruction according to the abnormal information of the target backlight driver, and sends the control instruction to the first-level backlight driver through the data line; The first-level backlight driver sequentially transmits the control instruction backward through the data line until it is transmitted to the target backlight driver, so as to process the target backlight driver through the control instruction; When there are multiple target backlight drivers, the controller generates a corresponding control instruction according to the abnormal information of each target backlight driver, and sends the corresponding control instruction to each target backlight driver in sequence according to the abnormal priority of each target backlight driver; The controller includes a system-level chip, and the system-level chip is connected to the first-level backlight driver of each column; The system-level chip determines a corresponding exception handling method according to the exception information of the target backlight driver, and generates a control instruction according to the exception handling method; the system-level chip is also used to upload the exception information of the target backlight driver to a remote monitoring server, and generate a control instruction after receiving the exception handling method sent by the remote monitoring server.

4. The display device according to claim 3, characterized in that The controller includes a system-level chip and a backlight controller, the system-level chip is connected to the backlight controller, and the backlight controller is connected to the first-level backlight driver of each column; The first-level backlight driver sends the abnormal information of the target backlight driver to the backlight controller; The backlight controller determines a corresponding abnormality handling method according to the abnormality information of the target backlight driver, and generates a control instruction according to the abnormality handling method; Or, the backlight controller sends the abnormal information of the target backlight driver to the system-level chip; the system-level chip determines a corresponding abnormal processing method according to the abnormal information of the target backlight driver, and sends the abnormal processing method to the backlight controller; The backlight controller generates a control instruction according to the exception handling method.

5. The display device according to claim 3, characterized in that The controller comprises a system-level chip, a timing controller and a backlight controller, wherein the system-level chip is connected to the timing controller, the timing controller is connected to the backlight controller, and the backlight controller is connected to the first-level backlight driver of each column; The first-level backlight driver sends the abnormal information of the target backlight driver to the backlight controller; The backlight controller determines a corresponding abnormality handling method according to the abnormality information of the target backlight driver, and generates a control instruction according to the abnormality handling method; Or, the backlight controller sends the abnormal information of the target backlight driver to the timing controller; the timing controller determines a corresponding abnormal processing method according to the abnormal information of the target backlight driver, and sends the abnormal processing method to the backlight controller; The backlight controller generates a control instruction according to the exception handling method; Or, the backlight controller sends the abnormal information of the target backlight driver to the timing controller, and the timing controller sends the abnormal information of the target backlight driver to the system-level chip; The system-level chip determines a corresponding abnormality handling method according to the abnormality information of the target backlight driver, and sends the abnormality handling method to the backlight controller; The backlight controller generates a control instruction according to the exception handling method.

6. The display device according to claim 4 or 5, characterized in that: Each backlight driver includes a feedback function module, and the feedback function module includes at least one of the following inspection modules: Input and output open circuit detection module, fault detection module, overheat detection module, light emitting unit open circuit detection module, light emitting unit short circuit detection module and drive channel voltage detection module; The input and output disconnection detection module detects whether the data line connected to the corresponding backlight driver is faulty; The fault checking module checks whether the corresponding backlight driver itself has a fault; The overheat detection module detects whether the temperature of the corresponding backlight driver is abnormal; The light emitting unit open circuit checking module checks whether the corresponding light emitting unit has an open circuit fault; The light emitting unit short circuit detection module detects whether the corresponding light emitting unit has a short circuit fault; The driving channel voltage checking module checks the voltage of each channel of the corresponding backlight driver.

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